Use of aliphatic carboxylic acids or anhydride(s)

摘要

Use of carboxlic acids (I) of formula (I) (where R1, R2, R3 are H, OH, COOH, ot 1-6C alkyl; and x, y, z are 0-6) and/or anhydrides (IA) of at least one (I) to inhibit formation or growth of water trees in ethylene (homo- and/or co-) polymers (II) under influence of strong electric fields. (A) Electrically insulating mixts. (III) based on (II) contg. on (III), 0.01-5% (all pts. wt.) at least one (I) and/or at least one (IA); and (B) Electrically semiconducting mixts. (IV) based on (II), contg. on (IV), (B1) 10-50% electrically conductive pigment; (B2) 0.01-5% at least one (I) and/or at least one (IA), are also claimed. (I) is pref. acetic, propionic, butyric, isobutyric, valeric, isovaleric, pivalic, lauric, myristic, palmitic, stearic, malonic succinic, glutaric, adipic, pimelic, suberic, azelaic, sebacic, malic, tartaric, racemic, tartronic, mesoxalic or citric acid and (IA) is anhydride of one of these acids and/or mixed anhydride of at least two of these acids, and is esp. citric acid and/or its anhydride.